6230-M (brass cage) bearing: complete specifications & equivalents
The 6230-M is a ISO 15 radial bearing sized 150 x 270 x 45 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 150 mm |
| Outer diameter D | 270 mm |
| Width B | 45 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 174 kN |
| Basic static load rating C0 | 166 kN |
| Fatigue load limit Pu | 4.9 kN |
| Reference speed (thermal) | 5000 rpm |
| Limiting speed (mechanical) | 4500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 11500 g |
| Manufacturer designation | 6230 M |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-27 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-27
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & 6200-series range
| Bore d | 5.906 in |
|---|---|
| Outer diameter D | 10.63 in |
| Width B | 1.772 in |
| ISO bore code | 30 |
| Radial section height (D−d)/2 | 60 mm |
| Smallest bore in 6200-series | 3 mm |
| Largest outer diameter in 6200-series | 540 mm |
| Width range across 6200-series | 2.5–85 mm |
| Bore position in 6200-series (smallest first) | 35 of 45 |
| Bore above smallest 6200-series size | 147 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6230-FAG | FAG | full Dimensions and internal design equivalent — standard interchange. | FAG counterpart FAG 6230 on the same 150×270×45 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6230-ZZ | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | NSK bearing NSK 6230ZZ on the same 150×270×45 mm envelope, but catalogue C/C0 differ (174/166 kN vs 194/168 kN) — envelope interchange only after a load check. |
| 6230-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | NSK bearing NSK 6230 on the same 150×270×45 mm envelope, but catalogue C/C0 differ (174/166 kN vs 194/168 kN) — envelope interchange only after a load check. |
| 6230-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | NTN bearing 6230 on the same 150×270×45 mm envelope, but catalogue C/C0 differ (174/166 kN vs 195/168 kN) — envelope interchange only after a load check. |
| 6230-2RS | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | NTN bearing 6230LLU on the same 150×270×45 mm envelope, but catalogue C/C0 differ (174/166 kN vs 195/168 kN) — envelope interchange only after a load check. |
| 6230-ZZ-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | NTN bearing 6230ZZ on the same 150×270×45 mm envelope, but catalogue C/C0 differ (174/166 kN vs 195/168 kN) — envelope interchange only after a load check. |
| 6230 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6230 (open arrangement) shares the 150×270×45 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 6230-M model number is decoded
In the 6200-series, the last two digits encode the bore: 6230 carries code 30 = 150 mm (code × 5). The envelope is 150×270×45 mm (5.906×10.63×1.772 in) with a 60.0 mm radial section height, C 174 kN, C0 166 kN and Pu 4.9 kN. The open 6230 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 4500 r/min, catalogue mass 11500 g.
Typical equipment & failure modes
Common applications
- crusher auxiliary drives
- large industrial gearboxes
- heavy conveyor drives
- hoists and winches
Known failure patterns
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
- electrical pitting in VFD-driven motors without shaft grounding
- edge loading from shaft deflection or housing misalignment
Selection pitfalls — read before you substitute
- Assign interference to the rotating ring: on a conventional shaft-mounted 150 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.
- Catalogue ratings for 6230-M (C 174 kN, C0 166 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.
- The M suffix on 6230-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 11500 g quoted mass includes the heavier cage.
- Open 6230-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.
- Plan a relubrication interval for 6230-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- At 150 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.
- Where two 6230 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.
- Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.
Frequently asked questions
What are the dimensions of 6230-M?
The SKF 6230 M measures 150 mm bore × 270 mm OD × 45 mm width (5.906 × 10.63 × 1.772 in), mass about 11500 g. It is open, with no shields or seals.
How does the bore code in 6230 work?
The final two digits of 6230 are bore code 30, multiplied by 5 to give 150 mm.
What internal clearance does 6230-M have?
Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life.
How long can a greased 6230-M be stored?
Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly.
What load can 6230-M take?
Catalogue values for 6230 M: dynamic C 174 kN, static C0 166 kN, fatigue limit Pu 4.9 kN. Use C in life calculation and C0 for static checks at 150 mm bore.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-27. Read our editorial & correction policy.